我用代碼獲取百度首頁原始碼的時候不轉換編碼獲取的原始碼只有一半，并且最后一次ssl_read的回傳值是-1，而每次接收到資料轉換編碼格式再拼接到string里獲取的原始碼只差3，4行。是和緩沖區有關嗎，請大佬們解答一下。
#include<iostream>
#include<Winsock2.h>
#include<WS2tcpip.h>
#include<string>
#include<sstream>
#include<openssl/ssl.h>
#include<openssl/err.h>
#pragma comment(lib,"ws2_32.lib")
#pragma comment(lib,"libssl.lib")
#pragma comment(lib,"libcrypto.lib")
using namespace std;
string Utf8ToGbk(const char* utf8) {
int len = MultiByteToWideChar(CP_UTF8, 0, utf8, -1, NULL, 0);
wchar_t* wstr = new wchar_t[len + (int64_t)1];
memset(wstr, 0, len + (int64_t)1);
MultiByteToWideChar(CP_UTF8, 0, utf8, -1, wstr, len);
len = WideCharToMultiByte(CP_ACP, 0, wstr, -1, NULL, 0, NULL, NULL);
char* str = new char[len + (int64_t)1];
memset(str, 0, len + (int64_t)1);
WideCharToMultiByte(CP_ACP, 0, wstr, -1, str, len, NULL, NULL);
if (wstr) delete[] wstr;
return str;
}
int main() {
SSL_load_error_strings();
SSLeay_add_ssl_algorithms();
const SSL_METHOD* meth = SSLv23_client_method();
SSL_CTX* ctx = SSL_CTX_new(meth);
if (ctx == NULL) {
ERR_print_errors_fp(stderr);
cout << "ctx error!" << endl;
return -1;
}
WSADATA wsadata;
ADDRINFO* res, * cur;
ADDRINFO hints;
SOCKADDR_IN* addr;
memset(&hints, 0, sizeof(ADDRINFO));
if (WSAStartup(MAKEWORD(2, 2), &wsadata) != 0) {
cout << "wsastartup error" << endl;
return -1;
}
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
getaddrinfo("www.baidu.com", "HTTP", &hints, &res);
cur = res;
addr = (SOCKADDR_IN*)res->ai_addr;
addr->sin_port = htons(443);
SOCKET sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (sock == INVALID_SOCKET) {
cout << "socket error" << endl;
return -1;
}
if (connect(sock, (SOCKADDR*)addr, sizeof(*addr)) == SOCKET_ERROR) {
cout << "connect error" << endl;
return -1;
}
int ret;
SSL* ssl = SSL_new(ctx);
if (ssl == NULL) {
cout << "ssl error" << endl;
return -1;
}
SSL_set_fd(ssl, sock);
ret = SSL_connect(ssl);
if (ret == -1) {
cout << "ssl_connect error " << endl;
return -1;
}
stringstream stream;
stream << "GET / HTTP/1.1\r\n";
stream << "Accept: */*\r\n";
stream << "Accept-Language: zh-Hans-CN, zh-Hans; q=0.8, en-US; q=0.5, en; q=0.3\r\n";
stream << "Connection: close\r\n";
stream << "Host: www.baidu.com\r\n";
stream << "User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.140 Safari/537.36 Edge/17.17134\r\n";
stream << "\r\n";
string request = stream.str();
ret = SSL_write(ssl, request.c_str(), request.size());
if (ret == -1) {
cout << "ssl_writ error" << endl;
return -1;
}
char pageBuf[1024];
string s;
while (true) {
if ((ret = SSL_read(ssl, pageBuf, 1023)) <= 0) {
cout << ret;
break;
}
s += Utf8ToGbk(pageBuf);
}
cout << s << endl;
SSL_shutdown(ssl);
SSL_free(ssl);
SSL_CTX_free(ctx);
closesocket(sock);
freeaddrinfo(cur);
WSACleanup();
}
uj5u.com熱心網友回復：
不呼叫Utf8ToGbk轉換編碼的時候，獲取的回應只有一半并且SSL_read 的回傳值是-1.，呼叫之后ssl_read的回傳值是0，但是獲取的回應還是缺少最后幾行。轉載請註明出處，本文鏈接：https://www.uj5u.com/houduan/267183.html
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